One aspect of the invention is a system for locating an object. The system
may include, for example, an object electromagnetic receiver, an audio
amplifier, an audio transducer, and an object microprocessor coupled to
the object electromagnetic receiver and the audio amplifier. The object
microprocessor is configured to ascertain whether a valid activation
signal has been received by the object electromagnetic receiver, and if
so, read a digital sound file, and ascertain whether the signal strength
of the received valid activation signal is above a first threshold. If
the signal strength is not above the first threshold, the object
microprocessor outputs a maximum sound level indicator signal; and if the
signal strength is above the first threshold, the object microprocessor
outputs a second tier sound level indicator signal.